mdi.pro Example File
mainwindows/mdi/mdi.pro

 HEADERS       = mainwindow.h \
                 mdichild.h
 SOURCES       = main.cpp \
                 mainwindow.cpp \
                 mdichild.cpp
 RESOURCES     = mdi.qrc

 # install
 target.path = $$[QT_INSTALL_EXAMPLES]/mainwindows/mdi
 sources.files = $$SOURCES $$HEADERS $$RESOURCES $$FORMS mdi.pro images
 sources.path = $$[QT_INSTALL_EXAMPLES]/mainwindows/mdi
 INSTALLS += target sources